204 



EARTHS. AGGREGATE. 64. Arenanus. 



Found in Britain and various parts of Europe^ of a rufous, yel- 

 low ifh, white, or grey colour; fometimes mixed with parti- 

 cles of mica, or containing vcftiges of ftielis: it is chiefly 

 ufed for griudHone?, rcythe-ftcn:rs, and buildings, and is fup- 

 pofed to produce coniumption in thofc who inhale its iine 

 dully particles. 



(oagmenta- Porous, not filtering water, confiding of rather larger 

 /«/• tranfparent grains. 



Coo coagmentata. Syst, nat, xii. 3. /. 63. n, g. 

 Siliceous fandftone. Sonx^erby Brit, min^ t. 49, 50. 

 Found in various parts of Europey and is more or lefs porous, 

 with rigid tianfparent grains. 



foraminu' 



kntus. 



FiltruTn* 



fundatiien' 

 talist 



Lightifh, irregularly pitted, filtering water, confifting of 

 fmalier grains. 

 Cos partic. arenof. Wall. fpt. i. p. 198. «. 9. 

 Found in MgermamiiOf where it is ufed for buildings. 



Hard, filtering water, confifting of larger equal grains. 



FUtering-JiQne, 

 Cos partic. arcnac. Syst, nat. xii. 3. p. 63. «. 10. 

 Cos aquam tranfmittens. WalLjyst. 1. />. 197. «.8. 

 Found in the Canaries^ on the fhores of Ne^iv Spain, in Saxony 

 and Bohemia, generally grey with pellucid angular grains. 

 Its chief ufe is to render fait waters fweet, or turbid ones 

 clear, 



Hardifh, confifting of unequal, angular, opake, larger 

 grains. 



Cos. partic. angulof. Sy/l. nat. xii. 3. p. 64. «. 16. 



Cos. partic. arcoof. Wall, fy ft, i. p. 195. », 6. 



Found in Britain, particularly in Devonjhire and Chefhire, in 

 Sifjeden and other parts j rigid to the touch, difficult to be 

 cut into pieces, falling into fand in a fmall degree of heat : 

 colour white, grey, greenifh, brown, red, or yellowiOi : it 

 is rather folid, and when cut horizontally is ufed for the 

 foundation of buildings* 



B. With a calcareoui cevient. 



irystallinus. Hard, grey, in aegregate rhombic cryftals^ united by a 

 cement of fpar, 

 Lajfone AQ, Par, 1777. p, 43. 



Hacq, fchr, htrL naturf, 2. /». 142. '» 



Freber bemerk, in neuf, het, 6f f . p. 5 1 . 



Found in feveral parts of France, and contains about 5 parts of 

 land to 3 of fpar. 



